atherton



Aug. 11, 1936. R T RTON 2,050,824

VENTILATING AND AIR TREATING APPARATUS Filed Feb. 8, 1934 3 Sheets-Sheet 1 76,}ATTNEY Aug. 11, 1936. G. R. ATHERTON VENTILATING AND AIR TREATING APPARATUS 3 Filed Feb. 8 1934 s SheetsSheet 2 1 fENTOR Giaeaf .477/0? 70 Aug. 11, 1936. G. R. ATHERTON 2,050,824

VENTILATING AND AIR TREATING APPARATUS Filed Feb. 8, 1954 3 Sheets-Sheet 3 Patented Aug. 11, 1936 UNETED STA'EEfi acsaszi rarest orriss VENTILATING AND AIR TREATING APPARATUS Application February 8, 1934, Serial No. 710,265

5 Claims.

The general object of the present invention is to provide improved ventilating and air treating apparatus of a character and type particularly adapted for use in providing ordinary living and 5 oflice rooms with ventilation air suitable for the health and bodily comfort of the room occupants.

In its preferred form, the improved apparatus comprises an air conditioning encased unit located in the room for which the air is to be con- 10 ditioned, and associated with a wall opening, which ordinarily is a window opening, through which external air may be drawn into the unit and after conditioning therein may be discharged into the room, and through which room air may 15 be recirculated and treated in its passage through the unit. Each such unit in its preferred form comprises air moving means and a heat exchanger which may be used either to cool the air passing through the unit when a room cooling effect is 20 desirable, or to heat the air passing through the unit when a room heating effect is desirable, and

l a specific object of the invention is to provide a heat exchanger which is suitably compactv and effective and is adapted for use in a heat condi- 5 tioning system supplying either a heating fluid or a cooling fluid to the heat exchanger as conditions require.

' In some instances the heat exchanger of the conditioning unit may comprise a section used exclusively for air cooling and a. section used exclusively for air heating, but one main object of the present invention is to provide an air conditioning system including a heat exchanger in each of its air conditioning units of such character 35 that all portions of the heat exchanger may be utilized in cooling air when air cooling is desired and that some or all portions may be used in heating air when air heating is desired, without giving rise to the difliculties which may make it 40 practically undesirable to pass an ordinary expansible refrigerant at any time through a heat exchanger which at another time receives a heating fluid such as steam or hot water. For the attainment of the last mentioned object of the 45 invention, I provide an air conditioning unit with a heat exchanger, through all portions of which cold water or other cooling liquid may be passed when an air cooling efiect is desired, and through scme or all portions of which hot water may be 5 passed, or into which steam may be introduced,

when an air heating effect is desired. My. present invention also comprises novel means for cooling water or other liquid and supplying the cooled liquid to a heat exchanger of the type 55 last referred to, and for supplying the latter with hot water or steam when an air heating effect is desired.

A further object of the present invention is to provide improved regulating or controlling means for an air conditioning unit of the above men- 5 tioned type to regulate the introduction of air to be treated in the unit from the external atmosphere or from the room in automatic response to certain controlling conditions, and to automatically control the operation of the air moving 10 means in accordance with the needs for such operation, both when the unit is employed to heat air and when employed to cool air.

My improved unit may advantageously include an air humidifying means in some cases, and when employed, the humidifying means may advantageously be controlled by means incorporated in and forming a part of the control system regulating the operation of the air moving means and the character or source of air supplied to the unit for treatment therein. My invention also comprises various novel features of construction andarrangement.

For a better understanding of the invention, its objects and specific advantages obtained with its use, reference should be had to the accompanying drawings and descriptive matter in which I have illustrated and described apparatus embodying preferred forms of my invention.

Of the drawings: 30,

Fig. 1 is a diagram of an air conditioning system with an air conditioning unit of the system shown in section on the broken line ll of Fig. 2.

Fig. 2 is a front elevation of the air conditioning unit shown in Fig. 1, with parts broken away and in section.

Fig. 3 is a sectional elevation of an apparatus unit adapted for interchangeable use in cooling or heating water used as a cooling or heating fluid in the heat exchanger of an air conditioning unit, 40 and Fig. 4 is a perspective view of a heat exchanger apparatus adapted for use in the air conditioning unit shown in Figs. 1 and 2, in lieu of the heat exchanger apparatus shown in those figures.

In the embodiment of the present invention i lustrated in Figs. 1 and 2, I represents the outer wall of a room having a window 2, the sill 3 of which is located directly over the air inlet passage portion 5 of the casing 41 of an air condi- 5o tioning unit. The top wall 4 of said casing serves as the window stool. External of the wall I, the casing 5 is provided with a hooded inlet 6 to the passage 5. The latter opens at its inner end to the upper portion of a. vertical chamber 1 in the casing 4, immediately in front of the wall i. The external air passing downward through the chamber 4 traverses a filter 8, which is inclined to extend across the upper portion of the chamber l, and is removable for cleaning through an opening 9 in the top wall or stool portion 4' of the casing 4. At the lower end and preferably but little above the floor level of the room in which the conditioning unit is situated, the chamber 1 opens through a port Ill into the lower end of a chamber ll extending between the chamber 1 and the front wall of the casing 4. The front casing wall is provided with a grilled port l2 for the admission to the chamber ll of room air. Air flow through the ports l0 and I2 is controlled by dampers "Ia and Ho, respectively, which are connected and operated as hereinafter described. The air entering the lower end of the chamber H passes upward across a heat exchanger l3 to the inlets M" of fans l4 which move the air through the apparatus. As shown each fan includes a fan or air propeller I5 which is carried and rotated by the shaft of an electric fan motor l6 arranged between the two fan casings. The motor l6 and fan casings l4 are attached to the under side of a horizontal wall part 11, which forms the top wall of the chamber H and is shown as spaced a few inches below the window stool or top wall portion 4 of the unit casing 4. The out ets from the fan casings i4 register with openings in the partition ll. Directly above each fan casing is a corresponding grilled air outlet member l8 mounted in an opening in the casing wall 4. The casing 4 is shown with compartments or chambers 19 and l9a at the opposite ends of the chamber III, for the convenient disposal of pipe connections, valves and control parts hereinafter referred to.

In the form shown in Figs. -1 and 2, the heat exchanger l3 comprises upper and lower inlet header elements 20 and 2| nippled together at 22 and located within the chamber ll adjacent the partition between that chamber and the chamber l9, and comprises upper and lower outlet headers 20a and 2la, respectively, nippled together at 22a, and located in the chamber ll adjacent the partition between the latter and the chamber 19a. The inlet headers are connected to the outlet headers 26a and 2la, respectively, by horizontal tubular elements 23. The latter advantageously extend through and are connected to metal plate or fin members 24, which are arranged to provide a multiplicity of narrow channels for the air moving upward to the chamber II, and to conduct heat between the walls through the tubes 23 and the air moving through the channels. The members 24 may advantageously be of the general form illustrated in Fig. 4. As shown in Figs. 1 and 2 the tubes 23 connecting the headers 20 and 2| to the headers 26a and 21a are arranged in three vertical rows with six tubes in each row, and the fin members 24 are arranged in three vertical rows, each fin plate being traversed by two of the tubes 23 arranged one above the other.

In the form shown in Figs. 1 and 2, the fluid employed to cool or heat the air passing through the chamber I l is supplied to the inlet header 20 through a horizontal inlet pipe 25 connected to the upper end of a vertical supply pipe 26 by a valve 2'l. The latter may be manually adjusted by means of a valve handle 210. above the casing wall 4, and attached to the stem of the valve 21 which passes through that wall. The header 200. is provided with a horizontal outlet pipe 26 shown as leading to a steam trap 29 which is located in the compartment H11 and connected to the upper end of a return pipe section 30. The header 2Ia is provided with a horizontal outlet pipe connection 3| leading to one inlet through the chamber ll, cooling liquid is sup-' plied to the header 20 through the supply pipe 26, valve 21 and pipe 25 and is withdrawn from the header Zia through the outlet connection 3| and three way valve 32, which then has its valve member 32a adjusted as shown in Fig. 1 to connect the pipe 3| to the return pipe 33 and to close communication between the latter and the pipe 30. In this condition of the apparatus, the heat exchanger apparatus l3 forms the heat absorbing element of a refrigeration or cooling system. The latter in the preferred construction illustrated diagrammatically in Fig. 1, cornprises a circulating pump 34 having its inlet connected to the return pipe 33 and having its outlet connected by a pipe 35 to the hot fluid inlet of a heat exchanger 36, the hot fluid outlet of the exchanger 36 being connected to the supply pipe 26. The apparatus diagrammatically illustrated in Fig. 1 was devised primarily and is especially adapted for use with water as the cool ing fluid passing through and cooled in the hot fluid chamber of the heat exchanger 36 to the supply pipe 26 and thence through the heat exchanger 13, return pipe 33, pump 34 and pipe 35 back to said chamber. As shown the heat exchanger 36 is in the form of a jacketed tank to the interior or hot fluid chamber of which the pipes 26 and 33 are connected, and in which is located a pipe coil 31 which receives the cold fluid supplied to the heat exchanger. As shown the cold fluid is the fluid refrigerant circulating through mechanical refrigeration apparatus which includes an expansion valve 38 to which the inlet end of the coil 31 is connected, a compressor 39 having its inlet connected to the outlet from the coil 31 by a pipe 40, a pipe 4| connecting the compressor outlet to the inlet of a refrigerant condenser 42 having its outlet connected to the inlet of a. receiver 43, and a pipe- 44 connecting the outlet of the receiver 43 to inlet of the expansion valve 38. Advantageously the operation of the motor 46'driving the compressor 39 is automatically regulated in accordance with the water temperature within the heat exchanger as by thermostatic means including a switch device 41' actuated by the pressure in a thermometer bulb 41 extending into said water space to control the supply of energizing current to the controller 45 for the motor 46. The switch device 41' may be of the'type disclosed in the Eggleston patent, 1,841,326 granted January 12: 1932, or of any other suitable type.

When conditions require, the air conditioning unit shown in Figs. 1 and 2 may be used to heat the air moving past the heat exchanger l3 in the chamber! I. In such cases, the heating fluid supplied to heat exchanger through the pipe 26 may be hot water, delivered to the pipe 26 through a pipe 48 from the outlet of a water heater 49,

the inlet of which receives water from a branch a of the delivery pipe 35 of the water circulating pump 34. The heater 49 may be a boiler or hot water heater of any usual or suitable type but as shown is a heat exchanger, within the water heating chamber of which is a steam pipe or coil 50 receiving steam from a steam supply pipe 5|, and discharging to a return pipe 52 through a steam trap 53. When the heat exchanger I 3 is receiving hot water from the heater 49, the refrigeration apparatus is out of service, and the heat exchanger element 36 is disconnected from the pipes 35 and 26 by the closure of cut-off valves 54, the heater 49 then serving as a bypass for water about the heat exchanger 38. When the latter is in service, the heater 49 is disconnected from the pipes 26 and 35 as by the closure of a cut-oil" valve 55 in each of the pipes 48 and 35a.

With the heat exchanger 36 out of service and the heater 49 in service, hot water may be caused to fiow through all of the tubes 23 of the heat exchanger l3 or only through the tubes 23 connecting the headers 20 and 20a, as conditions make desirable, by a suitable adjustment of the three way valve 32. In general when the heater 49 is in service, a sufiicient heating effect is obtainable with hot water flowing only through the tubes connecting the headers 20 and 26a, and the valve member 32a is then adjusted into the position in which the outlet connection 3! from the header Zla is disconnected from the return pipe 33, and the latter is connected through pipe 30, steam trap 29 and return connection 28 to the header 20a. With such adjustment of the valve 32a, the headers 2i and 2la and connecting pipes 23 are filled with a quiescent body of water at a temperature not significantly different from that of the air passing through the chamber H.

With the heater 49 employed to deliver hot water to the heat exchanger l3, the previously mentioned steam trap 29 is functionless and should be adjusted so as not to interfere with communication between the outlet connection 28 and the pipe 39. The heat exchanger l3 may be used as a steam radiator, however, and in such case the steam trap 29 should be adjusted to serve the purpose of an ordinary steam heating radiator outlet trap, and to this end the trap 29 may be of any usual or suitable thermostatic type. As shown, the trap 29 is connected to the header 20a above the lower end of the latter. In consequence with steam supplied to the header 290. through the pipe 25, all or substantially all of the heat exchanger below the connection 28 will be filled with comparatively cool quiescent water of condensation, thereby substantially reducing the effective heat radiating surface of the radiator, which needs substantially less heat radiating surface when used as a steam radiator than the amount of effective heat absorbing surface needed when the heat exchanger is used as a cold water containing cooling device.

When the heat exchanger I3 is used as a steam heating radiator, it may receive steam from any suitable source. In such case, for example, the heater 49 may serve as a fire heated generator; or. in the arrangement shown, steam may be supplied to the supply pipe 26 through a branch supply pipe 56 through a cut-off valve 5! which is closed when the fluid passing to the heat exchanger |3 comes either from the heat exchanger 36 or from the heater 49. With the heat exchanger l3 serving as a steam heating radiator, water of condensation passing from the valve 32 through the pipe 33 may be diverted from the inlet to the pump 34 through a condensation return pipe 58 connected to the pipe 33 through a cut-off valve 59 which is then open, but which is closed when the pump 34 is in operation. When the valve 59 is open the inlet to the pump 34 is disconnected from the pipe 33 by the closure of a cut-off valve 60 in the portion of the pipe 33 between its connection to the pipe 58 and the pum 34.

As shown in Fig. 1, the dampers la and Hi: are pivotally connected at 6! and 62, respectively, to the portions of the casing 4 directly above the respective ports l0 and I2 which they control. In the preferred construction shown, the dampers Ma and I2a are connected as by a link 62a for simultaneous adjustment in such fashion that when the port In is closed by the damper la, the port I2 is wide open, while when the latter port is closed, the damper la is adjusted to permit free flow through the port l0. As shown in Figs. 1 and 2, the dampers Illa and P241 are adjusted by a. relay motor 63 of any suitable type. The lat-. ter is a heat motor shown as comprising a bellows 64 forming a movable wall of a chamber containing an expansible fluid in which is heated electrically to increase the fluid pressure in the chamber and thereby contract or collapse the bellows 64 to close the damper la and open the damper l2a, or is allowed to cool to open the damper Illa and close the damper l2a. When the fluid pressure acting on the bellows 64 is reduced, the bellows elongates as a result of its own resilience, supplemented as shown by the action of a spring 64a, and thereby opens damper 50a and closes the damper l2a. To this end a stem or plunger 65 is shown as secured at its lower end to the lower end wall of the bellows 64 and engaging a part 65a pivotally connected at 65b to the casing of the motor 63. A link 66 connects the member 65a to a lever 61 pivotally connected at 68 to the casing 4. The end of the lever 6! remote from the link 66 is connected by a link 69 to the damper Illa. The motor 63 is thus similar in its operative principles to the "430 Motor Unit made and sold by the Detroit Lubricator Company. Means for automatically controlling the electrical heat supply to themotor 63 are hereinafter described.

As shown a water collecting pan or receptacle is located in the chamber H at the lower end of the latter in position to receive the water condensed out of the air passing through the chamber It and dripping down from the heat exchanger I3 as a. result of the cooling action of the latter when used as an air cooler, a drain pipe H being provided for discharging such water to waste. The pan '0 is also in position to collect excess water which may be discharged into the chamber H by a water spray humidifier 12 receiving water from a water supply pipe B3 through a humidifier valve 73A controlled in any I suitable manner. Advantageously the valve 13A is an electrically operated valve opened when supplied with energizing current. The operating means of the valve 83A may well include a heat motor similar in its operative principle to the heat motor 63, but the specific character of said operating means is not a material f ature of the present invention and need not be illustrated or described in detail. In the preferred arrangement shown, the energization of the valve operating means of the valve 13A is automatically controlled by means forming a part of anautomatic control system, which also controls both the supply of heat to the relay motor 83, and the energization of the fan motor I8. The control of the fan motor energization is an effective control of the heating or cooling effect of the heat exchanger I3, since with the latter receiving a heating fiuid or a cooling fiuid at a temperature which is constant, or approximately so, the actual room heating or cooling effect produced is dependent" for .all practical purposes upon the movement of air by the fans M.

In the particular form shown inFig. 1, the automatic control system comprises alternatingcurrent supply conductors 14 and 15, supplying energizing current to the terminals I6 of the motor I6 and also supplying current to the primary of a transformer 15, the secondary Winding terminals 16a and 16b of which supply energizing current to control circuits at a suitable voltage, lower than the voltage between the conductors 14 and 15. As shown the motor I8 has three terminals I8, one of which is connected by a conductor 11 to the supply conductor 14. The other two terminals I6 are shown as connected by conductors 18 and 18, respectively, to the terminals of a regulator 88 including a switch arm 8| adjustable along a potentiometer or auto transformer winding to thereby vary the speed of the motor. The switch arm 8| may be manually adjusted and is connected by a branch conductor 82 to the supply conductor 15 when a relay switch 83 is operated to connect switch contacts 84 in the conductor 82.

In the arrangement shown in Fig. 1, the relay switch 83 is operated to connect or disconnect the switch contacts 88 by the energization or deenergization of a relay switch winding 85. The winding 85 may be energized or deenergized by manual adjustment of a switch member 88 to one or another of two extreme positions. In one extreme position which is that in which the switch arm 88 is shown in Fig. 1, the winding 85 is open circuited, but in the other extreme position the switch member 88 closes an energizing circuit for the winding 85, which includes conductors 81 and 88 connecting the secondary terminals 18b of the transformer 18 to the switch arm 88, a, conductor 88 and a conductor 88 then connecting the switch arm -88 to' one terminal of the winding 85, the other terminal of the winding 85 being permanently connected to the secondary terminal 18a.

When the switch arm 88 is adjusted into a third position in which it connects the conductor 88 to a conductor 8|, the energization of winding 85 is made dependent on the operation of a thermostatic controller 82 which preferably is a so-called room thermostat of any well known type adjustable so as to be responsive to the temperature of the room for which air is being conditioned. The conductor 8| is connected to the contact 83 of the controller 82. The controller 92 may be set so that contact 83 is engaged by a movable switch contact carried by the temperature responsive element 84 of the controller 82 when the room temperature diminishes to a predetermined temperature, which, for example, may be '10 degrees F. The member 84 is connected by a branch conductor 85 to the previously mentioned conductor 88.

The position of the switch arm 88 permitting the energization of the relay winding 85 through the circuit includingthe conductor 8| may be called the winter time control position and is intended for use with the heat exchanger I3 operating as an air heater. The efiect of then thermostat on a rise in the room temperature to a maximum of F., for example, at which the fan should be started into operation to thereby increase the heat absorbing effect of the exchanger |3 which is then acting as an air cooler. The speed of the fan when in operation may be varied manually, as previously indicated, by 20 adjustment of the controller arm 8|.

As shown, the damper operating motor is energized to close the port I8 and to open the port I2, or deenergize to open the port I8 and close the port I2, by control mechanism including a manually adjustable switch arm 88 and a thermostat 88. When the switch arm 88 is adjusted into its uppermost position, the motor 83 is deenergized regardless of the condition of the thermostat 88. When the switch arm 98 is adjusted into its lowermost position, it connects the transformer secondary terminal 16b to a conductor I88 running to one energizing terminal of the motor 63, and the motor 63 is energized regardless of the condition of the thermostat 89, since the other energizing terminal of the motor 63 is connected by a conductor IN to the transformer secondary terminal 16a. When the switch arm 88 is in an intermediate position, it energizes a switch contact connected by a conductor I82 to the movable element I83 of the thermostat 98. The member I83 carries a contact. which is moved by predetermined variations in the temperature to which the thermostat 88 is subjected into and out of engagement with a contact connected by a conductor I84 to the conductor. In a preferred arrangement, the thermostat 88 is subjected directly to the temperature of the external atmosphere, orpreferably and as shown, to the temperature within the external air passage 1 of the air conditioning unit, and operates the motor 63 to open or close the external air inlet port I8 accordingly as the temperature to which the thermostat 88 is subjected, does or does not exceed a: predetermined temperature which, for example, may be 40 F., or may be higher or lower depending on the condition of use.

The operation of the humidifier 'l2 is advantageously subject to automatic control by a humidistat I which may be of any usual or suitable form. As diagrammaticallyillustrated in Fig. 1, the humidistat |85 includes a circuit controller which serves when the humidity of the room atmosphere is undesirably low to energize the valve operating means of the humidifier valve 13A. Since the humidifier effect is normally required only when the heat exchanger is serving as an air heater, the movable contact of the humidistat I85 may be connected by a conductor I86 to the conductor 8|, so that the humidifier can be brought into operation only when the switch member 86 is in its winter control position. The stationary switch contact of the humidistat |85 is'connected by a conductor I81 to one terminal of the valve 13A. The second terminal of the present invention latter is connected by a conductor I08 to the secondary winding terminal 16a of the transformer 16. When the conductors I01 and I06 are connected by the humidistat I05, the humidifier 12 is brought into operation, provided the switch member 86 is in its winter control position. The movement of the latter away from its winter control position, or the operation of the humidistat I05 to interrupt connection between the conductors I 08 and H11, closes the valve 13A and puts the humidifier I2 out of operation.

The means shown in Fig. 1 for supplying a heating fluid or a cooling fluid to the air conditioning unit shown in Figs. 1 and 2 may also supply heating and cooling fluid to the heat exchangers of other air conditioning units for the same room or for different rooms. To this end is it necessary to provide for each additional unit a separate branch supply pipe I09 from pipe 26, a separate branch return connection IIII to the pipe 33, and a separate branch connection II I to the return connection 58, with suitable cutoff valves "39a, H00, and I I la for the various supply and return connections individual to such additional unit so that the latter may be cut out of service at a time when some other unit or units of the system are in service.

In lieu of the separate water cooler 36 and heater 39 shown in Fig. 1, I may make use of the single heat exchange unit II2 shown in Fig. 3. The latter comprises a chamber 2' having an inlet H3 and an outlet II8 for water to be heated or cooled. The inlet H3 maybe connected to the delivery pipe 35 of a Water circulating pump 34 as shown in Fig. 1, and in such case the outlet IId may deliver water to the pipe 26 running to the inlet of the heat exchanger I3 of such an air conditioning unit as is shown in Fig. 1. The water passing through the chamber 2' may be heated by steam pipes II5 connecting a header inlet chamber III to a header outlet chamber H8, steam being supplied to the chamber II! by a supply pipe H9 and the outlet header chamber being connected to a return pipe I 20. The chamber II2" is provided with a vent pipe I2I for the discharge of air separating from the water within the chamber II 2'. The outer end of the vent pipe I2I may be connected to an air valve of any usual and suitable construction, but as such air valve forms no part of the it is not illustrated or described herein. The hot fluid chamber of the heat exchanger 36 may be provided with a vent pipe I2Ia similar to the pipe I2I.

When the water passing through the chamber H2 is to be cooled, the desired cooling or refrigerant efiect may be obtained by means of a pipe I22 coiled about the outer wall of the chamber H2 and encased in heat insulation material I23. The supply and discharge ends I22a and I22b of the pipe I22 may be connected to the pipes 43 and 88, respectively, of refrigerating apparatus of the character shown in Fig. 1. In the preferred construction illustrated in Fig. 3, the

- nected at one end to a fitting I25 surrounding pipe I22 is located within and extends through a pipe I23 which advantageously is of oval cross section, and which is appreciably larger in trans verse cross section than the pipe I22, and is coiled about the chamber I I2 and surrounded by the insulation material I23. The pipe I23 is conthe end portion I22a. of the pipe I22, and is provided with. an inlet I25, which forms the water inlet for the unit shown in Fig. 3 and may be directly connected to the delivery pipe of the circulating pump 35, when used in a system of the character shown in Fig. 1. The oppositeend of the pipe I24 is connected to a fitting I26 surrounding the end I 2217 of the pipe I 22 and provided with an outlet I2'I leading to the inlet II3 of the chamber H2. The pipes I22 and I24 are thus so related that the water passing into the chamber I I2 through the pipe I 24 is in good heat transfer relation with the pipe I22 and may be thoroughly cooled before its admission into the chamber 2'. In consequence the pipe I22 does not need to cool the water in chamber 2', but does serve to keep that water from absorbing heat from the atmosphere. When the outlet II I delivers water. to the pipe 26 of Fig. 1', the pipe 35 of Fig. 1 may be connected to inlet II3 through the fitting I25, pipe I24, fitting I26 and pipe I21.

In Fig. 4 I have illustrated a modified form of heat exchange apparatus, which may be substituted for the heat exchanger I3 of the unit shown in Figs. 1 and 2. The heat exchange apparatus ing radiator section I28 and a lower refrigerating section I3I. The section I28 comprises an inlet header I29, ah outlet header I30 and tubes connecting the headers and passing through fin plates 24 as do the tubes 23 of the heat exchanger I3 shown in Figs. 1 and 2. The section I III comprises the straight portions of a. refrigerant pipe coil I 32 passing back and forth through fin plates 23. As shown the pipe I 32 comprises four upper horizontal sections and four lower horizontal sections, and there are four sets of fin plates 24, each traversed by one upper and lower horizontal pipe portion. The inlet end I32 of the pipe I32 may receive refrigerant fluid such as cold water from the heat exchanger 36 of Fig. 1, through a pipe I33 and three way valve I34, and the outlet I shown in Fig. 4 comprises an upper steam heatend of the pipe I32 may deliver the refrigerant I valves I34 and I 36 are adjusted each into a sec-- ond position, the pipe I33 hot water through a valve nection I38 for the header I29 of the radiator I28, and the outlet header I3I! may then discharge to the pipe I35 through the header outlet connection I39 which, as shown, includes a thermostatic trap I33. As shown also an air vent I38 is connected to the header I 23 adjacent its connection to the inlet connection I38.

When it is or may be desirable to circulate a non aqueous refrigerant, such as is customarily employed in ordinary mechanical refrigeration apparatus, through the refrigerating section I3I, the latter may be provided with refrigerant supmay supply steam or I3I to the inlet eonply and return connections MI and I32, respectively, which are entirely separate from the circulating system including the heater section I23, so as to avoid all possibility of the admission of water or water vapor to the section I3I from said circulating system. As shown'in Fig. 4, cut off valves I3I and I 42 are provided for closing communication between the circulating system including the section I28 and the refrigerating section I3I when the refrigerant is supplied to and withdrawn from the latter through the pipes II and I82. In any particular installation in which it is intended to supply only a non-aqueous refrigerant to the refrigerating section I3I, the pipe connections including the valves MI and I42 shown in Fig. 4 between the refrigerating system including the section I3! and the section I28 may be omitted.

While in accordance with the provisions of the statutes I have illustrated and described the best forms of my invention now known to me,

. it will be apparent to those skilled in the art that changes may be made in the form of the apparatus described without departing from the spirit. of my invention as set forth in the appended claims, and that certain features of the invention may sometimes be used to advantage without a corresponding use of other features.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. Apparatus for ventilating a room and conditioning the room air comprising an air chamber having an outlet to said room and having an inlet for external air and an inlet for room air, an inlet regulating device operable between two positions in one of which the first mentioned inlet is open and the second mentioned inlet is closed, and in the second of which the last mentioned inlet is open and the first mentioned inlet is closed, and controlling means for said device including a temperature responsive element, means manually adjustable to operate said device into either of its two positions or to subject it to control by said element so that the latter may operate said device between its two positions in accordance with variations in the temperature to which said element responds.

2. Apparatus for ventilating a room and conditioning the room air comprising an air chamber having an outlet to said room and having an inlet for external air and an inlet for room air, dampers controlling said inlets, a device operable between two positions in one of which the first mentioned inlet is open and the second mentioned inlet is closed and in the second of which the last mentioned inlet is open and the first mentioned inlet is closed, and controlling means for said device including manual means for operating said device from either position into the other and alternatively operating automatic means including an element responsive to the temperature of the external air for operating said device to open and close the first mentioned inlet and simultaneously close or open the second mentioned inlet in accordance with predetermined variations in the external air temperature. 3. An apparatus of the character described, comprising an air chamber having an inlet for cold air, an inlet for room air, and an air outlet, a heat exchanger in said chamber to be traversed by the air flowing from said inlets toward said outlet, means responsive to temperature of the cold air to open said cold air inlet and close the room air inlet when the cold air reaches a determined temperature, and to close said cold air inlet and open said room air inlet when the cold air temperature reaches a determined lower temperature, means to supply either a cooling fluid medium or a heating fluid medium to said heat exchanger, air moving means in said chamber, control means responsive to room temperature to control said air moving means whether said exchanger is producing a heating or cooling effect, said control means including a device which acts upon an increase of room temperature to stop, and upon a drop of temperature to start the air moving means, when the heat exchanger is emitting heat, and which acts upon an increase of room temperature to start, and upon a drop of temperature to stop the air moving means, when the heat exchanger is cooled to absorb heat.

4. An apparatus of the character described comprising an air chamber having an inlet for cold air, an inlet for room air, and an air outlet, a heat exchanger in said chamber to be traversed by the air flowing from said inlets toward said outlet, means responsive to temperature of the cold air to open said cold air inlet and close the room air inlet when the cold air reaches a determined temperature and to close said cold air inlet and open said room air inlet when the cold air temperature reaches a determined lower temperature, means to supply either a cooling fluid medium or a heating fluid medium to said heat exchanger, air moving means in said chamber, control means responsive to room temperature to control said air moving means whether said exchanger is producing a heating or cooling effeet, and control means including a device which acts to stop or start the air moving means when the heat exchanger is emitting heat accordingly as the room temperature rises above or falls below a predetermined temperature, and which acts to start or stop the air moving means when the heat exchanger is cooled to absorb heat accordingly as the room temperature rises above or falls below a predetermined temperature condition diiferent from the first mentioned predetermined temperature.

5. Room ventilating and air conditioning apparatus comprising a room unit including an air treating chamber, and air moving means, heat exchanging apparatus optionally operable to provide an air heating or an air cooling efiect and humidifying means located in said chamber, and a control system for said unit including a device adjustable into and out of a heating position, and means cooperating with said device when the latter is in said heating position for subjecting said air moving means to control conditions related to the air heating requirements of said unit 'when said heat exchanging apparatus is operated to produce an air heating effect, and means controlling the operation of the humidifier rendered operable by movement of said device into said position.

, GEORGE R. ATHERTON. 

